I have a 2.4Ghz Intel Core 2 Duo Imac, 20 Inch. Bus Speed 800 mhz. I bought a 4 GB upgrade kit; 2 -2 GB 200 pin DDR2 SODIMM. I think I got the 800 mhz version. When I put both in and turn on the computer, it seems to go on (I can hear the fan) but the screen is black, and there no sound. When I replace one of the 2 GHz memory chips with a 1 MHz chip, it works fine, and the computer recognizes the 2 GHz chip. It doesn't seem to matter which chip I replace, or which slot I replace it in. But it doesn't work with both chips. Any thoughts? Thanks.
There are two versions of this model so it could be that you have the wrong speed. Please check within the System Profiler to see what speed your current memory is and then post the full Crucial part number from the new module labels and we can advise further.
Maulmod, Crucial Moderator UK ________________________________________